The demonstration revolves around the "Win a Wife" promotion held by a radio station in New Zealand, which is sending a man named Greg to Ukraine to find a bride. That's exactly the sort of sex tourism that the feminist group, known as Femen, is looking to fight:

"Femen warns the lucky winner of the New Zealand competition that he can expect an unhappy ending in Ukraine," activist Olexandra Shevchenko said in a statement on the movement's blog.

"Ukraine is not a brothel and Ukrainian women are not prostitutes."

No word yet on whether Charlie Sheen has just gone ahead and bought Ukraine as his personal playground, but we'll keep you posted.